<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/vue-2.4.0.js"></script>
</head>
<body>
    
    <div id="app">
        <input type="button" value="toggle" @click='flag=!flag'>
        <h1 v-if="flag">这是一个h1</h1>
    </div>
    <script>
        var vm = new Vue({
            el:'#app',
            data:{
                flag:false
            },
            methods: {
                
            },
        })
    </script>
</body>
</html>